JPH0410554Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention is used for heating or drying various industrial products, and the products are continuously conveyed into a furnace by a conveyor and moved intermittently within the furnace. This invention relates to a continuous heating furnace that heats articles while heating the product.

<Prior art> Continuous heating furnaces used for heating and drying industrial products generally have a conveyor installed inside the tunnel furnace, and the conveyor transports the articles into the tunnel furnace, where they are transported as they are. The structure is such that the heated and dried articles are transported through the furnace while moving through the furnace, and the heated and dried articles are carried out from the outlet on the opposite side.

<Problems to be solved by the invention> For this reason, when conventional tunnel heating furnaces require a certain amount of heating time, the total length of the tunnel furnace becomes long, and it cannot be installed in a small space. In addition, there was the inconvenience that workers had to work at the entrance and exit of the tunnel furnace, which were far apart.

The present invention was developed in order to solve the above-mentioned problems, and aims to provide a continuous heating furnace that can shorten the overall length of the furnace compared to conventional ones and reduce the work burden on the operator. purpose.

<Means for Solving the Problems> In order to achieve the above object, the continuous heating furnace of the present invention has a conveyor chain sprocket that can be rotated by a vertical axis within the furnace surrounded by a heat insulating wall. An outlet and an inlet are arranged side by side at one end of the furnace, and the other sprocket for the conveyor chain is horizontally supported outside the furnace near the entrance and exit by a vertical shaft, and an endless sprocket is installed between the two sprockets. A conveyor chain of the shape of a shape is hung horizontally, and a large number of transfer frames for loading and transporting articles are connected to the conveyor chain at predetermined intervals so as to move in and out of the furnace along the conveyor chain. is,
It consists of automatic doors installed at the exit and entrance of the furnace.

<Function> The conveyor of this continuous heating furnace is operated intermittently at approximately the interlocking intervals of the transfer frames, each transfer frame advances to the position of the next transfer frame and stops once, and while the conveyor is stopped for a preset takt time, After reloading the article on the transfer frame at the loading/unloading position, the machine is operated again to move by the distance between the transfer frames.

The items to be heated are placed on a transfer frame that is stopped at the loading/unloading position in front of the entrance, and are carried into the furnace one after another.While moving through the furnace in a U-shape, the items are heated ( dried).

Then, the heated (dry) treated articles are carried out from the outlet located in parallel with the inlet at the end of the furnace with the opening of the automatic door, and at the loading/unloading section, new articles are placed on the transfer frame and placed in the furnace again. Go inward.

<Example> Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 shows a plan view including a partial cross section of the continuous heating furnace, and FIG. 2 shows a front view thereof. The furnace 1 is formed into a box shape surrounded by a heat insulating wall 2, and has a pedestal 3.
placed on top. A conveyor chain sprocket 4 is attached to a vertical shaft 5 inside the furnace 1 (lower part near the back).
It is rotatably and horizontally pivoted by.

At the left end of the furnace 1 are inlets 6a, 6b and outlets 7a, 7.
b are arranged side by side next to each other, and an entrance/exit chamber 19 is formed inside the entrances 6a, 6b and exits 7a, 7b. In the center of the entrance/exit chamber 19, a sprocket 8 for a conveyor chain is supported horizontally by a vertical shaft 9 so as to be rotatable, and the lower end of the vertical shaft 9 is connected to a motor 10 with a speed reducer.

This sprocket 8 and the sprocket 4 in the furnace are in a horizontal position, and an endless conveyor chain 11 is horizontally stretched between them.The conveyor chain 11 passes through inlets 6a, 6b and outlets 7a, 7b, Sprocket 8 by 10
The conveyor chain 11 rotates by being rotationally driven.

Automatic doors 12a, 12b and 1 are provided at the inlets 6a, 6b and outlets 7a, 7b of the outlet chamber 19 at the end of the furnace 1, respectively.
3a and 13b are provided, respectively, and are automatically opened and closed by air cylinders attached to the top. In addition, a cutout is provided at the bottom of the automatic doors 12a, 12b and 13a, 13b for the conveyor chain to pass through, and a limit switch 14 is installed that is turned on when the automatic door is opened. An alarm such as a buzzer is activated. Note that the opening/closing mechanism of the automatic doors 12a, 12b and 13a, 13b may be a motor-driven winding mechanism using a wire.

In front of the entrance and exit at the end of the furnace 1, a loading/unloading section 15 having a flat part parallel to the bottom plate inside the furnace 1 is provided, and articles are placed on the conveyor chain 11 at predetermined intervals and transported. A large number of transfer frames 20 are connected via connecting portions 20a protruding from the ends of the transfer frames 20 so as to move along the conveyor chain 11 within the furnace 1 and between the loading/unloading section 15. Wheels 20b are provided on the bottom of the transfer frame 20 on the opposite side from the connecting portion 20a so that the transfer frame 20 can move smoothly while maintaining a horizontal posture.

A limit switch 16 is provided in the loading/unloading section 15 so that the transfer frame 20 stops at a fixed position when it reaches that position. When the limit switch 16 is turned on by the transfer frame 20, the conveyor motor 10 is turned on. stops. Furthermore, when one transfer frame 20 stops at a fixed position in the loading/unloading section 15,
Each transfer frame 20 is moved so that the transfer frames 20 before and after the transfer frame 20 stop just outside the entrances and exits 6 and 7 as shown in FIG.
are connected to the conveyor chain 11 with their intervals adjusted.

Furthermore, a blower 17 for air cooling is installed on the exit side of the entrance/exit chamber 19, and blows air to cool the heated article immediately after exiting from the exit. Also,
An air curtain device 27 is installed at the outlet 7a and inlet 6a of the entrance/exit chamber 19 to form an air flow vertically to prevent the hot air inside the furnace from being released into the entrance/exit chamber when the automatic doors 12a, 13a are opened. .

A ventilation passage 2 is provided on the ceiling inside the furnace 1 by a partition plate.
1 is formed, and a blower 2 is installed in the center of this ventilation passage 21.
2 is installed facing downward, takes in air from below, and blows air into the ventilation passage 21. A heater 23 is installed in the ventilation passage 21 to heat the air in the ventilation passage 21,
The heated air is circulated within the furnace 1 by a blower 22. Further, an exhaust duct 24 equipped with a damper is connected to the ceiling of the furnace 1 to appropriately exhaust the air inside the furnace. In addition, depending on the object to be heated, in addition to hot air circulation heating, it is also possible to arrange a large number of infrared heaters in the furnace and irradiate the object with infrared rays (far infrared rays) to heat the object.

Reference numeral 25 denotes a control panel for the heating furnace. The control panel 25 includes a conveyor takt time timer, temperature controller, automatic door and conveyor operation control circuit, etc., and also has a sound when the automatic doors 12 and 13 are opened. An alarm device 26 such as a buzzer is installed.

Next, the operation of this continuous heating furnace will be explained.

The articles to be heated (dried) are placed on a rack as shown in FIG. 2, and the rack is placed on the transfer frame 20. Inside the furnace 1, air is heated and circulated by the operation of the blower 22 and the heater 23, and the conveyor is operated intermittently at approximately the connecting interval of the transfer frame at every set time.

When the conveyor, that is, the transfer frame 20 is moved, the automatic doors 12a, 12b and 13a, 13b are opened,
When one transfer frame 20 reaches a fixed position in the loading/unloading section 15, the motor 10 is stopped by turning on the limit switch 16, and the conveyor is stopped. At this time, each transfer frame 20 is in a position as shown in FIG.
In particular, the transfer frames 20 before and after the transfer frame 20 located in the loading/unloading section 15 are located within the entrance/exit 19 . When the conveyor stops, automatic doors 12a, 12b, 13
a, 13b are closed, the conveyor is stopped, and heating (drying) is performed in the oven until a preset takt stop time has elapsed.

During the time when the conveyor is stopped, the loading/unloading section 15
The article on the transfer frame 20 at the position is replaced. At this time, the operator can take out the heated article and place a new article using the one loading/unloading section 15, and can work efficiently.

The articles that enter the furnace 1 sequentially from the entrance 6 are heated (dried) while moving in a U-shape therein, and when the heating is completed, they reach just before the exit 7a, and the automatic door 13a is opened. The conveyor is operated and the articles are taken out of the furnace and placed in cover 1 just outside the outlet 7a.
Stops within 8. At this time, the limit switch 14 is turned on by the movement of the automatic door 13b, and the alarm 2
6 sounds, the operator can easily know that the conveyor is moving and can safely transfer articles.

The heated article stops on the exit side of the entrance/exit chamber 19, receives air from the blower 17, and is cooled by air. Then, the articles that are blocked there advance onto the loading/unloading section 15 during the next tact operation, where they are taken out from the transfer frame 20, new articles are placed on the transfer frame 20, and they are carried into the furnace 1 in order again. It is then heated as it moves through the furnace. Entrance room 1
Since an air curtain device 27 is provided at the inlet 6a and outlet 7a between the automatic door 12 and the inside of the furnace.
When opening a, 13a, the amount of hot air inside the furnace exiting into the inlet/outlet chamber is limited to a minimum.

In this way, the articles after heat treatment are taken out after being cooled in the air, and the hot air in the furnace is not easily released to the surroundings, so the work environment is hardly affected by heat and the process is carried out efficiently. .

<Effects of the invention> As explained above, according to the continuous heating furnace of the invention, the outlet and inlet are arranged side by side at one end of the furnace,
The articles placed on the transfer frame are put into the furnace from the entrance,
After being heated while moving inside the furnace in a U-shape, the heated items are taken out from the exit next to it and returned to the loading and unloading section, so the overall length of the furnace is significantly reduced compared to conventional tunnel furnaces. can be shortened,
The operator only has to perform the work of loading and unloading articles at one location in the loading/unloading section, and can perform the work efficiently and easily. In addition, if an entrance/exit chamber is provided at the outlet and inlet sides of the furnace, and a blower is installed there to cool the heated items with air, the work of loading and unloading items can be done without being affected by the heat. I can do it.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a plan view including a partial cross section of a heating furnace, and Fig. 2 is a front view thereof. 1...Furnace, 2...Insulating wall, 4, 8...Sprocket, 5, 9...Vertical shaft, 6a, 6b...Inlet,
7a, 7b... Exit, 11... Conveyor chain, 12, 13... Automatic door, 20... Transfer frame.

Claims (1)

[Claims for Utility Model Registration] (1) A sprocket for a conveyor chain is rotatably supported horizontally by a vertical shaft in a furnace surrounded by a box-shaped insulating wall, and an outlet is provided at one end of the furnace. The other sprocket for the conveyor chain is horizontally supported by a vertical shaft outside the furnace near the entrance and exit, and an endless conveyor chain is horizontally stretched between the two sprockets. The conveyor chain has a large number of transfer frames placed at predetermined intervals for transporting articles.
A continuous heating furnace characterized in that the furnace is connected to move inside and outside the furnace along the conveyor chain, and automatic doors are provided at the outlet and entrance of the furnace. (2) The continuous heating furnace according to claim 1, wherein an entrance and exit chamber that is opened and closed by an automatic door is provided at the outlet and inlet of the furnace, and a cooling blower is provided on the exit side of the entrance and exit chamber. (3) The continuous heating furnace according to claim 2, further comprising an air curtain device for forming an air curtain near the automatic door in the entrance/exit room. (4) The continuous heating furnace according to claim 1, further comprising an alarm for notifying when the automatic door of the entrance/exit chamber opens.